Chordoid meningioma

Presentation

Patient Data

MRI brain

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Axial T1

Pre and post IV contrast multiplanar imaging of the brain has been performed demonstrating a right posterior frontal convexity extraxial mass. It has high T2 signal but is otherwise typical for a meningioma. No adjacent bony or parenchymal changes. Study other wise normal.

Histology

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H&E

MICROSCOPIC DESCRIPTION: The sections show a moderately cellular meningioma with infiltration into the attached dura. The tumour forms scattered whorls. The background contains abundant mucoid material, in which embedded cords of tumour cells are seen, imparting a chordoid-like appearance. The chordoid pattern occupies more than 50% of the total area. Microcystic change is also focally seen. The tumour cells have ovoid nuclei with no nuclear pleomorphism. Mitoses are inconspicuous. The tumour cells are progesterone receptor positive. The Ki-67 index is about 2% (not shown).

There is no necrosis. No brain parenchyma is seen. In one specimen tumour invades into, but not through, the cortical bone. There is no malignant change.